func (vm *VM) AddFunc(name string, fn interface{}) (bool, error) {
value := reflect.ValueOf(fn)
fnType := reflect.TypeOf(fn)
if value.Kind() != reflect.Func {
return false, fmt.Errorf("AddFunc only add function type")
}
_, err := checkFunc(fnType)
if err != nil {
return false, err
}
namePath := strings.Split(name, ".")
baseName := namePath[len(namePath)-1]
path := namePath[:len(namePath)-1]
L := vm.globalL
state := State{vm, L}
if len(path) <= 0 {
// _G[a] = fn
pushStringToLua(L, baseName)
state.pushObjToLua(fn)
C.lua_settable(vm.globalL, C.LUA_GLOBALSINDEX)
return true, nil
}
// _G.a.b.c = fn
ok, err := luaPushMultiLevelTable(L, path)
if !ok {
return false, err
}
pushStringToLua(L, baseName)
state.pushObjToLua(fn)
C.lua_settable(vm.globalL, -3)
return true, nil
}
func (lua *Lua) PushGoValue(value reflect.Value) {
switch t := value.Type(); t.Kind() {
case reflect.Bool:
if value.Bool() {
C.lua_pushboolean(lua.State, C.int(1))
} else {
C.lua_pushboolean(lua.State, C.int(0))
}
case reflect.String:
C.lua_pushstring(lua.State, C.CString(value.String()))
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
C.lua_pushnumber(lua.State, C.lua_Number(C.longlong(value.Int())))
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
C.lua_pushnumber(lua.State, C.lua_Number(C.ulonglong(value.Uint())))
case reflect.Float32, reflect.Float64:
C.lua_pushnumber(lua.State, C.lua_Number(C.double(value.Float())))
case reflect.Slice:
length := value.Len()
C.lua_createtable(lua.State, C.int(length), 0)
for i := 0; i < length; i++ {
C.lua_pushnumber(lua.State, C.lua_Number(i+1))
lua.PushGoValue(value.Index(i))
C.lua_settable(lua.State, -3)
}
case reflect.Interface:
lua.PushGoValue(value.Elem())
case reflect.Ptr, reflect.UnsafePointer:
C.lua_pushlightuserdata(lua.State, unsafe.Pointer(value.Pointer()))
default:
lua.Panic("wrong return value %v %v", value, t.Kind())
}
}
func unpackMapToLua(state State, m *P.Map) {
L := state.L
n := len(m.Elems)
C.lua_createtable(L, 0, 0)
for i := 0; i < n; i++ {
key := m.Elems[i].Key
value := m.Elems[i].Value
// key
switch key.(type) {
case int, int8, int32, int64, uint, uint8, uint32, uint64, float32, float64, string:
UnpackObjectToLua(state, key)
case []byte:
bytes := key.([]byte)
pushBytesToLua(L, bytes)
default:
continue
}
// value
UnpackObjectToLua(state, value)
C.lua_settable(L, -3)
}
}
func luaGetSubTable(L *C.lua_State, table C.int, key string) (bool, error) {
pushStringToLua(L, key)
C.lua_gettable(L, table)
ltype := C.lua_type(L, -1)
if ltype == C.LUA_TNIL {
C.lua_createtable(L, 0, 0)
// table[key] = {}
pushStringToLua(L, key)
C.lua_pushvalue(L, -2)
C.lua_settable(L, table)
}
ltype = C.lua_type(L, -1)
if ltype != C.LUA_TTABLE {
C.lua_settop(L, -2)
return false, fmt.Errorf("field `%v` exist, and it is not a table", key)
}
return true, nil
}
func (tbl *Table) Set(key interface{}, value interface{}) (bool, error) {
if tbl.Ref == 0 {
return false, fmt.Errorf("cannot set a released lua table")
}
L := tbl.VM.globalL
state := State{tbl.VM, L}
bottom := C.lua_gettop(L)
defer C.lua_settop(L, bottom)
tbl.PushValue(state)
vkey := reflect.ValueOf(key)
ok := state.goToLuaValue(vkey)
if !ok {
return false, fmt.Errorf("invalid key type for lua type: %v", vkey.Kind())
}
state.goToLuaValue(reflect.ValueOf(value))
C.lua_settable(L, C.int(-3))
return true, nil
}
// lua_settable
func (L *State) SetTable(index int) {
C.lua_settable(L.s, C.int(index))
}
// Does the equivalent to t[k] = v, where t is the value at the given valid
// index, v is the value at the top of the stack, and k is the value just
// below the top.
//
// This function pops both the key and the value from the stack. As in Lua,
// this function may trigger a metamethod for the "newindex" event.
func (this *State) Settable(index int) {
C.lua_settable(this.luastate, C.int(index))
}
// Does the equivalent to t[k] = v, where t is the value at the given valid
// index, v is the value at the top of the stack, and k is the value just
// below the top.
//
// This function pops both the key and the value from the stack. As in Lua,
// this function may trigger a metamethod for the "newindex" event.
func (s *State) Settable(index int) {
C.lua_settable(s.l, C.int(index))
}
func (l *Lua) pushGoValue(v interface{}, name string) error {
if v == nil {
C.lua_pushnil(l.State)
return nil
}
switch value := v.(type) {
case bool:
if value {
C.lua_pushboolean(l.State, C.int(1))
} else {
C.lua_pushboolean(l.State, C.int(0))
}
case string:
C.lua_pushstring(l.State, C.CString(value))
case int:
C.lua_pushnumber(l.State, C.lua_Number(C.longlong(value)))
case int8:
C.lua_pushnumber(l.State, C.lua_Number(C.longlong(value)))
case int16:
C.lua_pushnumber(l.State, C.lua_Number(C.longlong(value)))
case int32:
C.lua_pushnumber(l.State, C.lua_Number(C.longlong(value)))
case int64:
C.lua_pushnumber(l.State, C.lua_Number(C.longlong(value)))
case uint:
C.lua_pushnumber(l.State, C.lua_Number(C.ulonglong(value)))
case uint8:
C.lua_pushnumber(l.State, C.lua_Number(C.ulonglong(value)))
case uint16:
C.lua_pushnumber(l.State, C.lua_Number(C.ulonglong(value)))
case uint32:
C.lua_pushnumber(l.State, C.lua_Number(C.ulonglong(value)))
case uint64:
C.lua_pushnumber(l.State, C.lua_Number(C.ulonglong(value)))
case float32:
C.lua_pushnumber(l.State, C.lua_Number(C.double(value)))
case float64:
C.lua_pushnumber(l.State, C.lua_Number(C.double(value)))
case unsafe.Pointer:
C.lua_pushlightuserdata(l.State, value)
default:
// not basic types, use reflect
switch valueType := reflect.TypeOf(v); valueType.Kind() {
case reflect.Func:
// function
if valueType.IsVariadic() {
return fmt.Errorf("variadic function is not supported, %s", name)
}
function := &_Function{
name: name,
lua: l,
fun: v,
funcType: valueType,
funcValue: reflect.ValueOf(v),
argc: valueType.NumIn(),
}
funcsLock.Lock()
funcs = append(funcs, function)
id := len(funcs) - 1
funcsLock.Unlock()
C.push_go_func(l.State, C.int64_t(id))
case reflect.Slice:
value := reflect.ValueOf(v)
length := value.Len()
C.lua_createtable(l.State, C.int(length), 0)
for i := 0; i < length; i++ {
C.lua_pushnumber(l.State, C.lua_Number(i+1))
err := l.pushGoValue(value.Index(i).Interface(), "")
if err != nil {
return err
}
C.lua_settable(l.State, -3)
}
case reflect.Ptr:
C.lua_pushlightuserdata(l.State, unsafe.Pointer(reflect.ValueOf(v).Pointer()))
default:
// unknown type
return fmt.Errorf("unsupported type %v", v)
}
}
return nil
}